Carburetor



u 16, 1932- s. w. WHITEHURST 1,872,374

' CARBURETOR Filed May 13, 1930 INVENTOR $-WWHITEHUR6T.

ATTORNEY Patented Aug. 16, 1932 UNITED STATES PATENTFQFFICE SHEPARD W. WHITEHURST, OFFORT WORTH, TEXAS- CARBURETOR Application filed May 13, 1930. Serial No. 451,890.

ternal, which have fuel ports that feed at all.

speeds of the engines inproportion to the air intake. Another advantage is that the carburetor has no choke and does not waste gasoline'or fuel in starting the engine. Another advantage is that the needle valve rises in proportion to the amount of air passing through the air intake and spreads the fuel over the head of the needle valve seat above the air intake for causing a thorough mixing of the fuel and air which passes through the ports of the cup valve and the spider. Other objects and advantages will be fully explained in the following description and go the invention will be more particularly pointed out in the claims.

Reference is had to -the accompanying drawing which forms a part of this application.

g Fig. 1 illustrates the carburetor connected with a manifold.

Fig. 2 is a vertical section of the carburetor parts on an enlarged scale.

Fig. 3 is a side elevation of the cup valve which is in the sleeve valve.

Fig. 4. is an enlarged side elevation of the sleeve valve.

Fig. 5 illustrates a variation in connecting the carburetor to the manifold.

Similar characters of reference are used to indicate the same parts throughout the several views.

The carburetor is provided with. a casing 1 having fuel intake 2 integral therewith and a nipple 3 forming an adjustment for the plug 4 which is provided with a seat 5 for the needle valve 6. The nipple 3 is integral with the casing 1 and is interiorly threaded to receive the plug 1 which is threaded and screwed into the nipple 3 and forms the adjuster for the needle valve seat 5. The nipple 3 has an interior cavity 7 which forms a chamber for containing a head of fuel. The

be required. The mixture escapes from the adjuster 4 has a tubular passage 8 for delivering gasoline to the cup valve 9. The

amount of gasoline or fuel delivered to the cup valve 9 is controlledby the needle valve 6. The needle valve is't'apering and the passage is tapering adjacent tothe valve 6. The needle valve 6 has a stem 10 which projects ,1 loosely through anopening in the top of the cup valve 9 and is provided with a nut 32 rigid therewith and is raised-by the cup valve 9 so that fuel will be drawn up in proportion to the'height the cup valve is raised. V spring 11 is mounted on the needle valve about the stem 10 and between the valve 6 and the top ofthe cup "valve 9. A spider 12 is formedintegral with the cup valve 9 to form V V a guide for the needle valve 6. The spider/12 acts as a guide to direct the needle valve 6 should the valve 6 ever be carried aboveits seat5. 'A spider 13 is screwed downinto the casing 1 which is threaded to receive. the

spider 13. A spring 14; engages a boss 15 and r bears on the valve 9 for holding the valve 9 yieldingly down except when the engine is running. .t 7 I v The explosive mixture escapes from the cup valve 9 through the ports 16 into the cham-- ber 17 and the amount of explosive mixture T that passes throughthese ports is in proportion to the height the cup valve 9 'risesin the chamberll'. The -cup valve 9 constitutes in part the mixing chamberr. The mixture passes through more or less of the ports 16,

depending on'the 'height the valve 9 rises or is raised.

Air is admitted to the mixing chamber 18 a through casing 1, which has elongated slots r 19 and through ports 20 inthe sleeve valve 21.

The sleeve valve 21 is provided with a throttle connection 22 by which the valve 21 can be rotated to let in more or less air into the same; The connection 22is adapted to move in the elongated ports 19 and the valve can be rotated far enough to-cut' oi]? the air sup- ..ply entirely. A spring 23 has one end inserted in thevalve 21 and one end inserted in the casing 1 for' automatically bringing the sleeve valve 21 back to normal or closed position. With such structure the explosive mixture can be made' more or less rich as may cup valve 9 into the chamber'l'Z which will loo maintain a head of explosive mixture to be fed through the pipe 24 into the manifold 25.

Provision is made for release in case of back-fire. A nipple 26 is cast on the casing 1 and cored out to form a barrel for a plunger 27. The barrel has communication with the chamber 17 by means of an opening 28. The nipple or barrel 26 has a plurality of perforations 29. A cap 30 is screwed on the nipple 26 and a spring 31 bears against the cap 30 and against the plunger 27 In case of backfire the plunger 27 will yield more or less according to the force of the explosion and so open more or less of the perforations 29.

The carburetor will operate in any position, vertical, horizontal, or even in inverted position and may be connected directly to the manifold or by the connection shown in Fig. 1. f

What I claim is a 1. A carburetor having a casing provided with air and fuel intake ports, a sleeve valve rotatably mounted thereinand provided with air intake ports and a cup valve longitudinally movable in said sleeve valve and form ing a mixing chamber and provided with discharge ports at different distances from the head of the valve, means for holding said .cup valve yieldingly downward, a needle valve operatively connected with said cup valve, and a seat for said needle valve pro- .vided with a fuel passage therethrough ad- 7 j ustably mounted in said casing and provided with lateral fuel intake ports.

2. A carburetor having a casing provided with air and fuel intake ports and discharge ports, a sleeve valve rotatably mounted in ated discharge ports, means for holding said cup valve yieldingly downward, a needle feed valve operatively connected with said cup valve and a seat therefor provided with a'longitudinal fuelpassage therethrough and lateral fuel intake ports, and means for longitudinal adjustment of said needle valve seat for controlling the amount of fuel feed.

4. A carburetor having a casing provided with air and fuel intake ports, a sleeve valve rotatably mounted therein and provided with air intake ports adapted to register with the air intake ports of said casing and a cup valve movable longitudinally in said sleeve and forming a mixing chamber and provided with graduated discharge-ports, means l1olding said cup valve yieldingly downward, and a seat for said needle valve provided with a fuel passage therethrough adj ust-ably mounted in said casing and provided with lateral fuel intake ports for receiving fuel from the said casing provided with air intake ports 7 adapted to register with the intake ports ofsaid casing, means for rotating said valve to controlthe amount of air admitted thereto, a cup valve movable longitudinally in said sleeve valve by pressure oft-explosive mixture and forming a mixing chamber and provided with graduated discharge ports, means for holdin said cup valve yieldingly downward, a neetfie feed valve operatively connected with said cup valve and a seat therefor having a longitudinal fuel passage therethrough and provided with fuel intake ports, and means for longitudinal adjustment of said needle valve seat for controlling the feeding of the liquid fuel.

3. A carburetor having a casing provided with air and fuel intake ports and discharge ports, a sleeve valve rotatably mounted in said casingprovided with air intake ports adapted to register with the air intake ports of said casing, means for rotating said valve to control the amount of air admitted thereto and meansfor automatically'returning said sleeve valve to normal position, a cup valve movable longitudinally in said sleeve valve by pressure of explosive mixture and forming a' mixing chamber-and provided with gradu- 

